Why should it be "while I was walking"?
"While I walked I saw him"
Because 'walking' has an ongoing sense in your context: something happened (seeing him) in the middle of something else (walking). So, walking was in progress when you saw him.
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Because 'walking' has an ongoing sense in your context: something happened (seeing him) in the middle of something else (walking). So, walking was in progress when you saw him.
Tara2Why should it be "while I was walking"?
"While I walked I saw him"
'while' indicates action during a period of time. It forces a period interpretation on the following verb, so 'was walking' is not absolutely required. Nevertheless, the simple form is usually used with 'while' only when both parts of the sentence signify activity: My
Brave man, CJ!
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Tom